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mm: return a folio from read_swap_cache_async()

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The only two callers simply call put_page() on the page returned, so
they're happier calling folio_put().  Saves two calls to compound_head().

Link: https://lkml.kernel.org/r/20231213215842.671461-13-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2023-12-13 21:58:41 +00:00 committed by Andrew Morton
parent 69fe7d67cb
commit 6e03492e9d
3 changed files with 18 additions and 19 deletions
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22
mm/madvise.c
View File

@ -180,7 +180,7 @@ static int swapin_walk_pmd_entry(pmd_t *pmd, unsigned long start,
for (addr = start; addr < end; addr += PAGE_SIZE) {
pte_t pte;
swp_entry_t entry;
struct page *page;
struct folio *folio;
if (!ptep++) {
ptep = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
@ -198,10 +198,10 @@ static int swapin_walk_pmd_entry(pmd_t *pmd, unsigned long start,
pte_unmap_unlock(ptep, ptl);
ptep = NULL;
page = read_swap_cache_async(entry, GFP_HIGHUSER_MOVABLE,
folio = read_swap_cache_async(entry, GFP_HIGHUSER_MOVABLE,
vma, addr, &splug);
if (page)
put_page(page);
if (folio)
folio_put(folio);
}
if (ptep)
@ -223,17 +223,17 @@ static void shmem_swapin_range(struct vm_area_struct *vma,
{
XA_STATE(xas, &mapping->i_pages, linear_page_index(vma, start));
pgoff_t end_index = linear_page_index(vma, end) - 1;
struct page *page;
struct folio *folio;
struct swap_iocb *splug = NULL;
rcu_read_lock();
xas_for_each(&xas, page, end_index) {
xas_for_each(&xas, folio, end_index) {
unsigned long addr;
swp_entry_t entry;
if (!xa_is_value(page))
if (!xa_is_value(folio))
continue;
entry = radix_to_swp_entry(page);
entry = radix_to_swp_entry(folio);
/* There might be swapin error entries in shmem mapping. */
if (non_swap_entry(entry))
continue;
@ -243,10 +243,10 @@ static void shmem_swapin_range(struct vm_area_struct *vma,
xas_pause(&xas);
rcu_read_unlock();
page = read_swap_cache_async(entry, mapping_gfp_mask(mapping),
folio = read_swap_cache_async(entry, mapping_gfp_mask(mapping),
vma, addr, &splug);
if (page)
put_page(page);
if (folio)
folio_put(folio);
rcu_read_lock();
}

7
mm/swap.h
View File

@ -46,10 +46,9 @@ struct folio *swap_cache_get_folio(swp_entry_t entry,
struct folio *filemap_get_incore_folio(struct address_space *mapping,
pgoff_t index);
struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
struct vm_area_struct *vma,
unsigned long addr,
struct swap_iocb **plug);
struct folio *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
struct vm_area_struct *vma, unsigned long addr,
struct swap_iocb **plug);
struct folio *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_flags,
struct mempolicy *mpol, pgoff_t ilx, bool *new_page_allocated,
bool skip_if_exists);

8
mm/swap_state.c
View File

@ -533,9 +533,9 @@ struct folio *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
* __read_swap_cache_async() call them and swap_read_folio() holds the
* swap cache folio lock.
*/
struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
struct vm_area_struct *vma,
unsigned long addr, struct swap_iocb **plug)
struct folio *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
struct vm_area_struct *vma, unsigned long addr,
struct swap_iocb **plug)
{
bool page_allocated;
struct mempolicy *mpol;
@ -549,7 +549,7 @@ struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
if (page_allocated)
swap_read_folio(folio, false, plug);
return folio_file_page(folio, swp_offset(entry));
return folio;
}
static unsigned int __swapin_nr_pages(unsigned long prev_offset,